Li, C; Loh, T H; Tian, Z H; Xu, Q; Huang, Y (2017) Evaluation of chamber effects on antenna efficiency measurements using non-reference antenna methods in two reverberation chambers. IET Microwaves Antennas & Propagation, 11 (11). pp. 1536-1541.

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Abstract

In this paper, the evaluation of chamber effects on antenna efficiency measurements using non-reference antenna (NRA) methods is presented. Two reverberation chambers have been employed and they differ in dimensions and paddle stirrer configurations, therefore the corresponding electrical characteristics such as quality factors, decay constants, and enhanced backscattering constants are envisaged to be different. However it is found that these differences have little influence on the efficiency measurement of antennas-under-test. The antennas-under-test used for this study were a directional antenna and an omni-directional antenna. The discrepancy in the efficiency of the two antennas measured between the two chambers is less than 10% within their operational frequency bands. These results demonstrate that the non-reference antenna measurement techniques are robust. Further investigation shows that the directional antenna is slightly more prone to polarisation mismatch than the omni-directional antenna is. Therefore, polarisation stirring should be implemented when using the non-reference antenna methods for antenna efficiency measurement especially for directional antennas.

Item Type:	Article
Keywords:	Reverberation Chambers; Antenna Efficiency Measurements; Non-reference Antenna Methods
Subjects:	Electromagnetics > Wireless Communications
Divisions:	Engineering, Materials & Electrical Science
Identification number/DOI:	10.1049/iet-map.2015.0838
Last Modified:	01 Mar 2018 10:51
URI:	https://eprintspublications.npl.co.uk/id/eprint/7746